VOICE CODING DEVICE AND VOICE DECODING DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent giving unpleasant feeling to a receiving person even though various parameter information related to the linear prediction analysis of voices is temporarily destroyed in the voice coding/decoding device. SOLUTION: The voice coding device is provided with the voice coding processing section in which various parameter information of the voice synthesis is computed based on a sound source and a full polar type sound adjusting system model and inputted voices are coded for every frame unit and a voice coding monitoring and processing section in which the stability conditions of the voice synthesis system are evaluated relative to more than one or two parameter information among the obtained parameter information after the completion of the coding of each frame and if the evaluation result is abnormal, the information related to the amplitudes among the generated voice coding data is suppressed. The voice decoding device is provided with the voice decoding and processing section which receives the generated voice coded data and reproduces synthesized voice signals and the voice decoding monitoring and processing section in which the stability conditions of the voice reproducing system are evaluated relative to more than one or two parameter information among the inputted coded data and if the evaluation result is abnormal, the output of the reproduced voice signals is suppressed.